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Impaired neural response to speech edges in dyslexia
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In: ISSN: 0010-9452 ; Cortex ; https://hal.archives-ouvertes.fr/hal-03493371 ; Cortex, Elsevier, 2021, 135, pp.207 - 218. ⟨10.1016/j.cortex.2020.09.033⟩ (2021)
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Reading-Related Brain Changes in Audiovisual Processing: Cross-Sectional and Longitudinal MEG Evidence
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In: J Neurosci (2021)
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| 3 |
Spatiotemporal dynamics of postoperative functional plasticity in patients with brain tumors in language areas
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In: ISSN: 0093-934X ; EISSN: 1090-2155 ; Brain and Language ; https://hal.archives-ouvertes.fr/hal-03489627 ; Brain and Language, Elsevier, 2020, 202, pp.104741 -. ⟨10.1016/j.bandl.2019.104741⟩ (2020)
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Phase−amplitude coupling between theta and gamma oscillations adapts to speech rate
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Abstract:
Low‐ and high‐frequency cortical oscillations play an important role in speech processing. Low‐frequency neural oscillations in the delta (<4 Hz) and theta (4–8 Hz) bands entrain to the prosodic and syllabic rates of speech, respectively. Theta band neural oscillations modulate high‐frequency neural oscillations in the gamma band (28−40 Hz), which have been hypothesized to be crucial for processing phonemes in natural speech. Since speech rate is known to vary considerably, both between and within talkers, it has yet to be determined whether this nested gamma response reflects an externally induced rhythm sensitive to the rate of the fine‐grained structure of the input or a speech rate−independent endogenous response. Here, we recorded magnetoencephalography responses from participants listening to a speech delivered at different rates: decelerated, normal, and accelerated. We found that the phase of theta band oscillations in left and right auditory regions adjusts to speech rate variations. Importantly, we showed that the peak of the gamma response—coupled to the phase of theta—follows the speech rate. This indicates that gamma activity in auditory regions synchronizes with the fine‐grain properties of speech, possibly reflecting detailed acoustic analysis of the input.
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Original Articles
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URL: https://doi.org/10.1111/nyas.14099
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6850406/
http://www.ncbi.nlm.nih.gov/pubmed/31020680
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The Role of Slow Speech Amplitude Envelope for Speech Processing and Reading Development
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